The coordination chemistry of two symmetric fluorene-based organic ligands with cuprous chloride

Abstract: Two novel symmetric fluorene-based ligands, namely, 2,7-bis­(1H-imidazol-1-yl)-9,9-dimethyl-9H-fluorene [L1 or (I), C21H18N4] and 2,7-bis­(1H-imidazol-1-yl)-9,9-dipropyl-9H-fluorene (L2), have been used to construct the coordination polymers catena-poly[[di­chlorido­dicopper(I)(Cu-Cu)]--2,7-bis­(1H-imid­azol-1-yl)-9,9-dimethyl-9H-fluorene], [Cu2Cl2(C21H18N4)]n, (II), and catena-poly[[tetra-2-chlorido-tetra­copper(I)]-bis­[-2,7-bis­(1H-imidazol-1-yl)-9,9-dipropyl-9H-fluorene]], [Cu4Cl4(C25H26N4)2]n, (III). There are three types of C-HN hydrogen bonds in (I), resulting a two-dimensional network in the ab plane, including a chiral helical chain along the b axis. Compounds (II) and (III) are related one-dimensional polymers. In both, CuI atoms connect the symmetric ligands (L1 or L2) into a one-dimensional chain. In (II), the {[CuICl2]-} unit, acting as a co-anion, adheres to the one-dimensional chain through a weak CuCu inter­action. However, in (III), the {[CuI2Cl4]2-} unit links two different chains into a one-dimensional rope-ladder-type chain. In addition, there are C-HCl hydrogen bonds and - inter­actions in the extended structures of (II) and (III), the difference is that the chains in (II) are linked into a two-dimensional network while the chains in (III) are stacked into a three-dimensional framework.

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